how can I return the smallest missing positive int in array in js

how can I take the samllest missing positive integer from array of integers in js (I didn’t fiund any answer for my question, all I found was in other languages)

example

[-2, 6, 4, 5, 7, -1, 1, 3, 6, -2, 9, 10, 2, 2]

>Solution :

good question

let nums = [-2, 6, 4, 5, 7, -1, 1, 3, 6, -2, 9, 10, 2, 2];

console.log(smallestMissing(nums));

function smallestMissing(nums) {
    let n = 1;
    while (nums.includes(n)) n++;
    return n
}

EDIT:
Can you please try to tell me what’s wrong with my code without downvoting?